Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 0Eh
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  Interrupt:   21h     Function:   0Eh
 
  Title:       Select Disk
 
  See also:    Get Current Drive, @SetDrv
 
  Description:
 
     Selects the specified drive to be the current, or default, disk
     drive and returns the total number of logical drives in the
     system.
 
     Input                                    Output
 
     AH = 0Eh                                 AL = Number of logical
     DL = Drive code (0 = A, 1 = B,...)            drives in system
                                    -♦-